Procurement of pre-mix concrete for the construction of a double Larinier fish pass on Ballsgate weir, Aymestrey, Herefordshire.

Location: NGR SO417660, Post code HR6 9UT


  1. During June, July and August 2018 the Wye and Usk Foundation will be construction a double larinier fish pass on Ballsgate weir as part of the ERDF funded DNMP project. The weir is owned by the Environment Agency.
  2. The work will be undertaken by Wye and Usk Foundation staff run by a CDM and NEBOSH trained Head of Operations, overseen by a Clerk of Works.
  3. The fish pass has been designed by Fishtek consulting (Annex 1).
  4. The landowners have consented to access and a work compound being established
  5. Relevant consents have been secured by EA which are provisional to the appointment of a Clerk of Works to oversee the construction.
  6. The working timeline for the works is:



Appointment of a Clerk of Works and Coffer dam contractors

14th May

Secure all consents

10th June

Finalise method statement

16th June

Establishment of site compound

1st July

Install coffer dam and dry site

5th July

Start construction of fish pass structure

8th July

Completion of fish pass structure

9th August

Installation of Larinier

16th August

Completion of installation of rip rap

23rd August

Completion of smolt notch

28th August

Remove all materials from site and restore to previous state

4th September

Open fish pass

15th September


Task we are seeking to procure:

  1. We are seeking supply of circa 44m3 of ready mix concrete that-

Complies with BS 8500-2

RC to have minimum strength class of C35/45

Structure life 100yrs

Max W/C ratio 0.40

Min. cement (kg/m3) 380

Max cement content (kg/m3) 430

Cement or combination types CEM lll/A C111

Chloride class 0.2

Max agg. Size 20mm

Min sand content N/A

Min air content N/A

Additives 0.91kg/m3 fibrin or cemfiber polypropylene micro fibres

Colour: TBC5

Target slump (mm) 100

Slump range (mm) +25 to -25

Pump able mix option req: yes

Accelerated early strength mix option req: yes

Minimum cover: 60

Identify testing (sampling rate) 1 per hour.


Tendering process.

Opens: 18th April 2019

Closes: 10th May 2019

Requirements for tender:

- Confirmation of capability

- Confirmation of availability

Tenders to be sent to Simon Evans by email.

Supporting Documents

Annex 1a Site Plan

Annex 1b Site Plan

Annex 1c Site Plan

Annex 2 Draft Method Statement Ballsgate Fishpass